Fixing PCBs but no schematics?
Sometimes you have to troubleshoot PCBs - often obsolete - that have no documentation. Here's an ideal solution for these situations: recreate the schematics with ABI Electronics' RevEng reverse engineering equipment. Semi-automated, it can check components connections and produce authentic circuit diagrams for quite complex boards. From this netlist you can also recreate the board layout to remove the obsolescence issue too!
You need to get RevEng! https://www.youtube.com/watch?v=xlV-9UuOaZI